Drilling-jig



J. F. FE'TTERLY.

DRILLING JIG.

APPLICATION FILED DEC.I8,1919.

Patented Aug. 30, 1921.

2 SHEETS-SHEET 1.

3 mm mm 5 .I. F. FETIERLY.

DRILLING JIG.

APPLICATION FILED DEC,18, 1919.

Patented Aug. 30,1921.

2 SHEETS-SHEET 2- INVENTOR Qm Q JOHN F. FETTERLY, OF ALTOONA,PENNSYLVANIA.

DRILLING-(FIG.

Application filed December 18, 1919.

Specification. of Letters Patent.

Patented Aug. 30, 1921. Serial No. 345,865.

(FILED UNDER THE ACT or Mason 3, 1883, 22 STAT. n, 625.)

T 0 all whom it may concern.-

Be it known that 1, JOHN F. Fn'rrnRLY, a

citizen of the United States, and a resident of Altoona, county ofBlair, and State of Pennsylvania, have invented an Improvement inDrilling-Jigs, of whichthe followin is a specification.

Ihe invention described herein may be used by the Government, or any ofits oilicers or employees in prosecution of work for the Government, orby any other person in the United States, without payment of any royaltythereon.

This invention relates to improvements in drilling jigs especiallyadapted for use in drilling test specimens or bars from gun forgings.Said device is preferably used in connection with a radial drillingmachine of either the full or semi-universal type.

The objects are to provide simple, durable and inexpensive means wherebya gun forging from which a number of transverse test specimens are to bedrilled, and the tool carrying arm may be so adjusted and locked, thatsaid drillings may be made at any angle on a plane at right angles tothe axis of the work.

Another object is to mount the drill carrying arm in such a manner as topermit its adjustment into positions in relation to the .work fordrilling a plurality 01": specimens without disturbing or causingsubsequent adjustment of the forging or work to be operated on after ithas been once set and locked in position.

A further object is to provide means for firmly supporting the drillholder of the ordinary form or radial drill in such a man ner as to holdthe drill to its work when entering the same and also to maintain thework as well as the drill in such a position as to prevent binding dueto the feed of the tool through the work after it has been started.

Another object is to mount the work and tool in such a manner as toenable the adjustment of the work on its own axis, to bring other partsthereof, fromwhich specimens are to be taken, in line with the drill,without disturbing said drill and with little delay.

Similar numerals indicate corresponding shank of the arbor is an arm 31.

parts in all the figures or" the drawings in which Figure 1 is andrilling jig;

Fig. 2 is a vertical longitudinal section of elevation of the improvedthe tool carrying end of the drilling mechanism; V

'Fig. 3 is a vertical transverse section on line 3-3 of Fig. 1 showingdotted position of the tool supporting arm and its parts;

Fig. 4 is a detail vertical transverse section on line 14: of Fig. 1;and

Fig. 5 is a detail horizontal section on line 5-5 of Fig. 1.

Referring to the drawings by numerals, 1.0 indicates an adjustable blockin which is mounted the chuck 11 adapted to support one end of theforging shown in dotted lines at 12. Said block is preferably mounted onthe floor in line with the platen of an ordinaryform of radial drill.

A supporting bearing block 13 having a bearing 14 and flanges 15 issecured to the platen 16 of a radial drill (not shown) by bolts 17 andstraps 18. Said bolts 17 are provided with heads 19, seated in grooves20 in the platen, and nuts 21, to clamp the bearing block 13 in place onthe platen within the sweep of the tool carrying spindle of a radialdrill.

A clamping cap 22 fitting on bearing block and secured in position bybolts 23, securely clamps arbor 2a of the'work support in the bearingblock.

The arbor, having the shank portion 25, is provided at one end withlever bar openings 26, and at its other end with head 27 in which pins28 are provided for insertion into seats provided in the chuck 29.

The chucks 11 and 29 are provided with the usual adjustable blocks 30for clamping a tubular forging 12 in place.

Mounted for rotary adjustment on the The inner end of arm 31 is providedwith a split bearing adapted to be clamped on the arbor in any desiredposition by clamping screw 32 having cylindrical head 33 at one endprovided with lever bar openings 34 and at its other end which issquared, with removable screw head 35-pinned at 36 to said screw.

Th clamping screw 32 is threaded as shown at 37 in arm 31. Forconvenience in adjusting the parts, screw head 35 is provided with leverbar openings 38, and with the lever bar openings 34 in the head end ofthe clamping screw, provide for adjustment of said screw from either ofits ends.

The arm 31 is provided with a slot 39 closed at its outer end by armplate 40 secured in place by bolts 41.

The slot 39 is provided on opposite faces with ribs 42. A flanged box 43is slidable in the slot and is provided with an opening 44 for thereception of the tool guiding arm.

The tool guiding arm or bushing holder is provided with the smooth shankportion 45, the threaded portion 46 and head portion 47.

The shank portion 45 of the tool guider extends through a spacer 48arranged between the head 47 and one face of arm 31, through the flangedbox and only partly through washer 49 at the opposite face of arm 31.From a position within the washer 49, the shank is screw threaded as at46.

A collar nut 50 is threaded on the shank of the tool holder and whenscrewed home securely clamps the tool guiding arm in place in the arm31.

It will be noted that, owing to the flanged box 43 being slightly lessthan the thickness of the arm 31, and the threadedportion 46 of theshank extending within the washer, when the collar nut, having the leverbar openings 51, is tightened up, the inner faces of spacer 48 andwasher 49 will be clamped against opposite faces of the arm 31 andsecurely hold the parts in position in the arm 31.

The head portion 47 of the tool guider is provided with an opening 52 inwhich pin 53 is seated to prevent rotary movement of a bushing 54, saidbushing being mounted in the opening 55 of the head.

A hollow tool 56 for drilling test specimens is mounted in the drillingshank 57 of any preferred form of radial drill, said drill bar beingmounted in the bushing 54 in the head of the drill guider, and is drivenin a well known manner.

The operation of the improved universal drill jig is as follows: The gunforging is rigidly mounted on chucks 11 and 29. The drill tool isbrought into proper position by the adjustment of arm 31 and toolcarrier, and the clamping members 22, 32 and 50 tightened up, when thetool may be started and a specimen drilled from the forging.

By reference to Fig, 3 of the drawings, the parts are shown as adjustedinto position for drilling specimens on either side of the center oraxis of the work.

The drilling may be made at corresponding angles into the forgings andconcentrically about the center thereof by setting the drill supportingarm at the desired angle and drilling the first specimen and then thesubsequent drillings may be made by simply loosening'the clamping screw32 and cap 22 and revolving the work to the next position, withoutdisturbing the tool support, which will be held in position by the drillshank 57 of the radial drill, the clamped mounting of the tool guider,and the loosened mounting of the arm 31 on the arbor.

Having described, my invention, what I claim as new and desire to secureby Letters Patent, is z- 1. In a drilling mechanism, the combinationwith a work support, of an arm mounted on the work support andadjustable circumferentially around its support, and a tool guidingmember mounted on the arm.

2. In a drilling mechanism, the combination with a work support, of anarm mounted on the work support and a tool guiding member mounted on thetool supporting arm and adjustable to bring the axis of the tool into aplurality of positions in a plane at right angles to the axis of thetool guiding member.

3. In a drilling mechanism, the combination with a work support of anarm mounted on the work support and adjustable circumferentially aroundthe axis of the work support, and a tool guiding member mounted on thearm and adjustable to bring the axis of the tool into any position in aplane at right angles to the axis of the tool guiding member.

In a drilling mechanism, the combination with a work support of an armmounted on the work support and adjustable circumferentially around theaxis of the work support, and a tool guiding member mounted on the armand adjustable to bring the axis of the tool into any position in aplane at right angles to the axis of the tool guiding member and worksupport.

5. A drilling machine having a rotatably adjustable work support, an armadjustable about the axis of the work support, and a tool guiding membermounted on the arm with its axis parallel with the axis of the worksupport and adjustable to bring the axis of the tool into any positionin a plane at right angles to the axis of the.tool guid mg member.

6. In a drilling machine, the combination of a rotatably adjustable worksupport, an arm circumferentially adjustable about the axis of the worksupport and mounted on the work support, and a tool guiding memberadjustable on the arm.

7. A drilling mechanism consisting of a rotatably adjusting worksupport, an adjustable arm mounted on the support and a tool guidingmember on the arm adjustable rotatably onits own axis and radially tothe axis of the work support.

8. A drilling jig for test specimens consisting of a Work support havingan arbor for rotary adjustment in a bearing block, an arm mounted. onand adjustable circumferentially around the arbor, a tool guiding membermounted on the arm and rotatably adjustable on its oWn axis andadjustable on the arm radially as to the axis of the arbor, and meansfor locking the parts in their adjusted position.

9. A drilling mechanism consisting of a rotatably adjustable Workholder, an arm circumferentially adjustable about the axis of theWork-holder, and a rotatably and radially adjustable tool guiding membercarried by the tool supporting arm.

10. A drilling jig consisting of a Work support, an arm, a tool guidingmember rotatably adjustable on its own axis and radially adjustable tothe axis of the Work support, and common locking means for the rotaryand radial adjustment of the tool guiding member.

11. A drilling machine consisting of a bearing block, a Work supporthaving an arbor for adjustment in the bearing block, an arm mounted onand adjustable about the arbor, a tool guiding member mounted on the armadapted for adjustments; rotatably on its own axis, longitudinally ofthe supporting arm and circumferentially around the Work support, andcommon looking means for the rotary and longitudinal adjustment of thetool guiding member.

JOHN F. FETTERLY.

